Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cff334b6d0a755…

MALICIOUS

PDF

45.5 KB Created: 2021-05-20 01:54:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 625ea4a2e4e767e844539ea8703cc82c SHA-1: 27ab262d3e47ed5de790d5810dbde3dedd645fe2 SHA-256: 25cff334b6d0a755d495a12257c26586b755414be2355d59ab26db81efd17b58
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which is identified as a malicious redirector. The primary link directs users to 'coin-master-free-stuff-links-game-hack', suggesting a scam or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs indicate an attempt to exploit user interest in game-related cheats to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/coin-master-free-stuff-links-game-hack In PDF document text
    • https://lesegais.ru/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/optifine-pe_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://lesegais.ru/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • https://lesegais.ru/images/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aa6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA6 26004 bytes
SHA-256: 56163ed7355699c2dd211e4ef9de4c2447c953dfa92e13edd2d28a6cf4852992
font_01_sfnt_off000086a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00009046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9046 18020 bytes
SHA-256: 4a31ce4ad0cb96257d099b2c128198fdf2dff202f4a157870e4b630be465ac9f

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